Intel Xeon E5 2670 's Advantages
Higher base frequency (2.6GHz vs 2.3GHz)
Lower TDP (115W vs 145W)
Intel Xeon E5 2696 v3 's Advantages
Released 2 years and 6 months late
Higher specification of memory (2133 vs 3)
Larger L3 cache size (45MB vs 20MB)
More modern manufacturing process (22nm vs 32nm)